Solvent for nitrocellulose.



1T0 all whom it may concern:

winning e. nmnsng'ormw Yonx, N. Y., Assrnon To run comm,

. i or new YORK, 11.1, A conronn'rron or sonv'mv'r FOR nrmoonnnunosn I No Drawing.

Be it known that 1, WILLIAM G. LINDSAY,

a citizen of-the United States, residing in the city of New York, State of New. York, have invented certain new and useful Improvements in Solvents for Nitrocellulose, of which the following is a specification.

U The various compositions to which the present invention relates are empl( )yed in the arts mainly, substances and in films used for photographic and therapeutic purposes, and .consists of soluble pyroxylin or nitrocellulose combined with or dissolved in certain other substances or menstrua known as solvents o pyroxylin- Although the different compounds of this class-islithatro-f V solvents,

a solid or dried material, the di flere nt proc,-

esses of conversion into this final, solid; forminvolve, as is well understood,the employ ment of pyroxylin solutions or mixtures, of varying consistency or fluidity, dependent generally 1 l.s1e1gonthe proportion and kind of solvent j .to-fthe amount of the pyroxylin. c

There are two classes of solvents liquid spirit, is a good' example, andsolid solvents,

of which camphor 1s a good representative.

Solvent mixtures are also formed by combin ing' two or more substances with each other. The components of th a casemay not necessarily be possessed of dividual solvent power-.1 Forfinstancqah cohol, which is practicallyv a non-solvent ,in'

itself, forms a' good solventinixtu r'e" when at, require the. e pl y.- Q P QX mixtures in the}'solvent,-"'

single substances being rarely used for such,

, cry and appllcatlon 'of new. single solvents,

combinations of yet it has are producedalone. 7

as imitations of natural final or useful the the solution promoted suitable 'mixing. .The solu pared .may be solvents, .or non-so en methyl. or 'ethyl alcohol, cetone, ethyl aceas .to plasticity, stifiness of which methyl alcohol, orwood e mixed 'solventinsuch ter's Patent'is:

ing of a solut on "new omp camphor is 'dissolvedin it. The various applications of this ment of largely on t Q ed also" the jfin'ventio'nz of solvents by which efiects'" quite difierent from those pro-, duced when .smgle solvents are employed The actionof -some solvents or diluents 1 is quite distinct that of others, liquid or solid, in that they require a shorterorlonger time for seasoning of the material, and inthe case of a solid solventthey leave it incorporated with the resulting-dried 1 product after the evaporation of the liquid, solvent sothat it can be molded into forms under'heat ,andpressure. 1 g V v II- have discover d that 'ethylenechlorhydrin CH CIGH OH is a valuable solvent of nitro cellulose. It has a boiling point of about 129 C.,'is substantially insoluble in sgeciflcation of Letters ratent. V May 28,1912. Application filed h s 11, 1911. *Serialno. as. {1

water; is stable and the resulting products, such as films, varnishes, coatings, sheets, I

solid objects, etc., 1 are substantially free from odor.

As one example of carrying out my inv venti'onl practically I proceed as follows: I take one part of nitrocellulose and introduce it into ten parts by weight ethylenechlorhydrin.- The nitrocellulos' issolves slowly;

' alone? or such :as,

itatesetc; I V

: or solid objects prepared by allow ing' the solutions to evaporatejare' particularly tough and flexible and substantially without odor unless camphor'has been used.

What I claim and desire to. secure by g of s ufo ir f -ix'1-.ethy1- enechl -hydrin.i ..in' admixture other 3. new. compositioniofg:matterlconsist i- 'ing' oig a solution; chl h y rin.

f nitrocellulose in ethyl- ;with other so v n s-511a solid-q matters suchl ascoloring WILLIAM V sensing and with other 

